| 摘要 |
1415725 Seaming non-metallic sheet material CONTAINER CORP OF AMERICA 18 Sept 1973 [15 March 1973] 43790/73 Heading B5K [Also in Division B8] Apparatus for bonding together adhesively coated surfaces CF of a paperboard container body CB conveyed by a conveyer 11 comprises a nozzle 13 for directing heated air against the surfaces CF, a first conduit 15 connected between a source of the heated air and the nozzle 13, means in the conduit 15 for directing the heated air away from the nozzle 13 upon stopping of the conveyer 11 and comprising a valve VM at the end of the conduit 15 normally closing the same, a second conduit 22 concentrically positioned within the conduit 15, the conduit 22 being connected to the nozzle 13 and having an opening 24 spaced from the valve VM for conducting the heated air to the nozzle 13, and means responsive to the stopping of the conveyer 11 for opening the valve VM to direct the heated air from the nozzle 13 thereby preventing overheating of the surfaces CF. As shown, the bodies CB are conveyed by flights 12 on the conveyer 11 and have a pair of closure flaps CF at each end thereof. The air is supplied to the conduit 15 through a heater device 14. Upon stopping of the conveyer 11, a sensor S operates a solenoid 19 which is energized to open the valve VM to allow the heated air to escape to the atmosphere. The conduit 15 is formed with a restriction 26 to create a Venturi effect at the opening 24 of the conduit 22 in the conduit 15 to reduce the pressure thereat and reverse the direction of flow of the heated air in the conduit 22 when the valve VM is opened and remove hot air from discharge openings 23 of the nozzle 13. |
